body{
    background-color: #4e4f51;
    // c1c4c9
}


header{
    height: 40px;
    margin-left: 30px;
    margin-top: 30px;
    font-size: 18px;
    color: #fff;
}
.main{
    margin-top:90px;
    margin-left: 40px;
    position: relative;
    height: 300px;
    width: 300px;
    background-color: #f2f2f2;
    .main-1,.main-2,.main-3,.main-4{
        position: absolute;
        height: 50px;
        width: 50px;
        
    }
    .main-1{
        border-top: 4px solid #1f9ff8;
        border-left: 4px solid #1f9ff8;
    }
    .main-2{
        right: 0;
        border-top: 4px solid #1f9ff8;
        border-right:4px solid #1f9ff8;
    }
    .main-3{
        bottom: 0;
        border-bottom: 4px solid #1f9ff8;
        border-left: 4px solid #1f9ff8;
    }
    .main-4{
        bottom: 0;
        right: 0;
        border-bottom: 4px solid #1f9ff8;
        border-right:4px solid #1f9ff8;
    }
    .main-zhong{
        width: 300px;
        height: 1px;background-color: #1f9ff8;
        animation: yidong 2s infinite linear;
    }
    
   
} 
@keyframes yidong {
    from{
        transform:translateY(0px)
    }
    to{
        transform:translateY(300px)
    }
}



.main-zi{
    color: #fff;
    margin-top: 20px;
    margin-left: 110px;
}


.main-zhao{
    color: #fff;
    margin-top: 50px;
    margin-left: 160px;
    button{
        border: none;
        background: none;
        color: #fff;
        margin-left: 5px;
    }
    
}
.main-zhao-1{
    color: #ffc718;
    margin-top: 50px;
    margin-left: 160px;
    display: none;
    button{
        border: none;
        background: none;
        color: #ffc718;
        margin-left: 5px;
    }
    
}
